Warning

 

Close

Confirm Action

Are you sure you wish to do this?

Confirm Cancel
BCM
Member Login

Site Notices
Posted: 1/15/2021 2:34:08 PM EST
Does anyone know what the actual dia. of a M16A1 gas tube pin should be? The reason I am asking this is because I'm using an A2 FSB on a barrel I received from Del-Ton. I called and they told me the pin dimensions should be 5/64×5/16. I have some 5/64 roll pins and man they sure seem to be just big enough to NOT fit
Link Posted: 1/15/2021 2:42:55 PM EST
[Last Edit: 1/15/2021 2:43:20 PM EST by _DR]
The Colt gas tube pins I have used have always been tapered.
Link Posted: 1/15/2021 2:55:37 PM EST
.081 x .312
Link Posted: 1/15/2021 2:59:19 PM EST
Hole in FSB and gas tube are both spec'd at .078" DIA + .003".
Link Posted: 1/15/2021 3:02:48 PM EST
[Last Edit: 1/15/2021 3:03:54 PM EST by JLS1911]
I'm new to this building retro stuff and didn't realize that this pin comes in a tapered style. Using those dimensions of .081/.312, the ones I have should work. But man they sure seem big to these old man eyes. Thanks gentlemen!
Link Posted: 1/15/2021 11:24:14 PM EST
[Last Edit: 1/15/2021 11:24:49 PM EST by lysanderxiii]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By _DR:
The Colt gas tube pins I have used have always been tapered.
View Quote

From the first Colt "Model 01", the pin used to secure the gas tube to the front sight has been an MS16562-106 tubular, slotted, spring pin (nominal 5/64 x 5/16).
Link Posted: 1/16/2021 10:07:16 PM EST
Thanks for all your help guys. The pin worked perfectly. This thing is so ugly it's actually sexy. Wish I knew how to post pictures here. Again thanks for your help.
Top Top